3352-speakers Sarah in Tampa is at it again and found another very useful hack to allow your Zune to be used to play to your PC Speakers through the cradle or sync cable.

1. Add the following key to your registry, either by creating a reg file with the text, or go there yourself and create the binary value:

[HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Class\{4D36E96C-E325-11CE-BFC1-08002BE10318}\0000\Settings\filter\SpeakerHp]

"EnableInputMonitor"=hex:01

2. Reboot

3. Enable the input monitor by going to "Control Panel" --> "Sound" --> "Speakers/Headphones." Click on "Properties," then click on the "Levels" tab and enable the input monitor button.
4. You're done - rock out!

Source: Sarah In Tampa | Channel 10  (Thanks Antonio)